- 1concerning the most basic and important parts of something; thorough and complete synonym far-reaching the need for radical changes in education demands for radical reform of the law radical differences between the sexes
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- 2new, different, and likely to have a great effect radical ideas a radical solution to the problem radical proposals
- 3in favor of thorough and complete political or social change the radical wing of the party radical politicians/students/writers
- 4(old-fashioned) (slang) very good
NAmE//ˈrædɪkli//
adverb The new methods are radically different from the old. Attitudes have changed radically.See radical in the Oxford Advanced Learner's DictionaryCheck pronunciation: radical